Elastic chair



FIG. 1 is a perspective view of an elastic chair showing the new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a right side elevational view thereof.

The broken lines shown in the drawings illustrate portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for an elastic chair, as shown and described. 